Strengths: The development of Solo and Guitar's relationship is nice as they each face different challenges in life; the cinematography and music complement the story well. The story of Kao and Phu is also cute.

Weaknesses: The series could have done with less fluff at the start and given more time for resolution in the last part; the addition of a practically redundant set of characters (Khim, Khem, Perth and Petch) that challenges even the editors who have done a rather good job with the editing overall.

Overall: I like this quite a lot though it has several weaknesses.

I have not read or heard of the novel prior to watching the first episode, but my expectation after watching the first episode was that it would be a sweet and lighthearted BL, full of fluff but still cute enough to satisfy a BL fan. For a few episodes, this seems to be where the series is headed. However, the story of Solo and Gui also takes a more serious turn later, which is both a good and a bad thing.

One problem is that the earlier episodes with more fluff could have been condensed and the story with the slightly more serious turn from the point Gui's foster mother falls sick and passes away could have been given more space for development. A BL with a simpler story would simply end with Solo and Gui becoming officially together after some episodes of childish jealousy on Solo's part. However, it is interesting how Solo and Gui stand by each other through more difficult moments in life and how their relationship is strengthened as a result. The story does turn out to be rather moving without causing one to cru.

The way the relationship develops is a pleasant surprise. However, while I appreciate the way the story moves on the the problems experienced by the couple, the final episode leaves me feeling ambiguous. Perhaps Solo is really being unrealistic in thinking that he can run away with Gui (given that his sole source of money is his father), but I also admire his determined rebellion against his father (which Gui chides him for). In fact, Gui's willingness to make a bet of sorts with Solo's father and arranged fiancee to leave Solo isn't that great a thing either--why should he willingly break up with Solo if he fails his internship?

Of course, it turns out that Solo's father isn't as cold as he appears to be (an overly convenient means of resolving the crisis quickly in the last episode). Neither does he really disapprove of Gui. But it remains that he can and will break up Solo and Gui if he really wants to. The same father has someone stalk his son and report to him everything the son does. Yet, Solo's father is supposed to really love his son. This vision of familial love offered seems to me rather disturbing.

The execution of the final part of the series regarding Solo's father and Gui's internship can possibly have more finesse. Although the series has more than just hinted at the problem that Solo's father would present, his return to Thailand seems timed to suit the structure of the story than anything else. In short, the problem isn't so much a weak story but weak storytelling skills. By the end of Episode 11, we can anticipate how the crisis involving Solo's father is going to be quite suddenly resolved in the final episode. To be fair, it didn't feel all that rushed when I was watching it. Nevertheless, everything just gets resolved too conveniently--instead of solving a problem, it turns out that the problem has never been much of a problem to begin with.

Where storytelling is concerned, the story of the second couple, Kao and Phu seems better, but the story may seem a little hackneyed at first, with Kao being the persistent guy who goes after and melts a seemingly cold Phu. Nevertheless, there is much to love about Kao--he may be persistent and borderline stalkerish, but he doesn't really go overboard. The actor has brought the character to life, especially with a nice scene in Episode 11 where Kao sees Phu before the latter leaves for England: beneath the bunny make-up, we can see that his smile isn't fake or false but a sincere attempt to look happy while saying goodbye, and it isn't exaggerated when he is unable to sustain the smile and starts crying.

Perhaps the biggest weakness of the series is the inclusion of the siblings Khim and Khem and their relationships with the doctors Petch and Perth. While their part of the plot isn't bad as a story, which are better intertwined. Khim is the only tenuous connection with the BL couples as she happens to be Gui's colleague in a cafe. Because the focus isn't on the siblings and doctors, events in their parts of the series happen abruptly and with insufficient attention. Just look at what is going on and we can see that there is potential for a separate series:

1. Perth has a secret crush on Petch
2. Petch has a crush on Khim
3. Khim has a serious illness
4. Khim is a fujoshi/yaoi fan, and Petch feigns romantic interest in men to motivate her so that she has something to live for (OK, that sounds weird)
5. Not knowing that Perth has a crush on him, Petch tries to fake dates with him to give Khim fodder for her fujoshi imagination
6. Perth is upset when he finds out; he refuses to help Petch
7. Khim's brother, Khem, mistakenly thinks that Petch likes him and falls in love with Petch
8. Petch kisses Khim, Khem sees it and almost falls out with his sister.
9. Petch and Khim end up together
10. Maybe Perth and Khem too...?

Couldn't the same space have been used for Solo/Gui and Kao/Phu instead? The effect would have been better--I wish there had been more exposition on the backgrounds on Solo and Gui in the first few episodes (e.g. Gui's relationship with his foster mother, Gui's struggles as a student who has to work, Solo's loneliness and tensions with his father).

Despite some obvious flaws, Oxygen isn't really awful at all. The cinematography and editing manage to conceal and even make up for some of its flaws. To its credit, it doesn't seem as disjointed as a series like Kiss Me Again (a series with a BL couple). I also love Solo and Gui as a couple. The way they care for and respect each other is quite unusual in BLs, which often rely on a more conventionally masculine guy protecting a weaker one or being the center of attraction. The series also has a lot of cuteness (human puppies and bunnies) mixed with more serious events that make the love between the couples more touching.